Spray gun

ABSTRACT

A dual-spray gun having a pair of discharge nozzle supply openings discharging in a flexible disposable nozzle having a mixing chamber so as to prevent gun clogging and time wasted in cleaning the gun after each spraying operation.

United States Patent H Inventor Billy L. Woods 3818 West Ocotillo,Phoenix, Ariz. 85019 Appl. No. 840,713

Filed July 10, 1969 Patented Nov. 30, 1971 SPRAY GUN 1 Claim, 4 DrawingFigs.

U.S. Cl 239/307, 239/422, 239/428, 239/527 Int. Cl B05b 7/04 Field ofSearch 239/304,

References Cited UNITED STATES PATENTS 3/ l 887 Grey 9/1964 Lancaster...4/l965 Plos et al.

FOREIGN PATENTS 9/l96l Canada Primary Examiner-Lloyd, L. King AssistantExaminer-Reinhold W. Thieme Anorney-Willard L. Groene PATENTEDunv 30 Ian4/? SUPPLY INVIJNTOR. B/LLY L VV0005 AT T 0R1VEY SPRAY GUN BACKGROUND OFTHE INVENTION This invention pertains to spraying equipment for paintand chemicals, and is particularly directed to dual-spray guns formixing a plurality of chemically interactive materials and spraying asmixed on a work surface.

Heretofore, in spray gun apparatus which mixed interacting materials asthe material was sprayed, it was necessary to completely clean and washwith solvent the materials remaining after the spraying operation sothat it would not clog up the unit. This entailed considerable time andcost in keeping the gun constantly washed out and much delay betweeneach painting operation. The use of complicated solvent rinsingapparatus was also involved.

SUMMARY OF THE INVENTION One of the objects of this invention is toprovide a spray gun form delivering, mixing and spraying interactingliquids which is easy and quick to maintain in cleaned-up condition anddoes not become clogged when the gun is not in use.

Still another object is to provide a multiple-spray gun having aflexible and disposable combined mixing chamber and nozzle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation of spraygun incorporating the features of this invention.

FIG. 2 is a top view, partly in section on the line 4-4 of FIG, 1.

FIG. 3 is a circuit diagram showing the supply and pumping systemassociated with the spray gun.

FIG. 4 is a section on the line 4-4 of FIG. 2.

DESCRIPTION OF THE PREFERRED, EMBODIMENT As an example of one embodimentof this invention, there is shown a dualor multiple-spray gun having aframe with a downwardly extending'front portion 11 in which is carried aplurality of material flow control valves 12 and 13 of conventionalconstruction, each having an operating stem 14 actuated by a commontrigger 15 associated with the usual pistol grip 16.

The material supply lines 17 and 18 connected to the respective flowcontrol valves 12 and 13, are connected to the discharge ports ofappropriate positive displacement pumps, the pump 21 having an intakeline 23 connected to a supply reservoir 24 containing one kind ofmaterial while the pump 22 has an intake line 25 connected to a supplyreservoir 26 having another kind of material interactive with thematerial in reservoir 24.

Both of the pumps 21 and 22 are simultaneously driven by any suitablemeans such as by an appropriate air-operated motor 27 connected througha line 28 and pressure regulator 29 to an air pressure supply line 30. Afurther air supply line 31 is connected to the compressed air input tube32 terminating in the air passageway 33 on the discharge manifold block34. Discharge tubes 35 and 36 from the respective valves 12 and 13 alsoconnect to the material passageways 37 and 38 of the discharge manifoldblock 34.

The passageways 33, 37 and 38 discharge through the front face surface39 of the discharge manifold block 34. A nozzle 40 has a suitabledischarge tip 41 and an enlarged bell-shaped portion 42 demountablysupported on the outer periphery 43 of the discharge manifold block 34fonning with the front face surface 39 a mixing chamber 44 forintermixing of materials and the air from the passageways 33, 37 and 38prior to the discharge of the mixture out through the nozzle passageway45 and the tip 41.

With the air supply constantly issuing from the passageway 33,manipulation of the trigger 15 turns on and off and regulates the flowof the material into the mixing chamber 44 and out through the nozzletip 41 At the conclusion of a spra operation, the nozzle 40 IS simplypulled from the penp ery 43 of the discharge manifold 34 and the face 39thereof wiped clean and a wiping cloth or paper towel. A new cleannozzle is then reinstalled on the periphery 43 ready for the nextspraying operation. Thus no intermixed materials from reservoirs 24 and26, which would set up rapidly in any difficult-to-get-at passageways orcavities, is present in this unique arrangement.

Iclaim:

l. A spray gun for initially mixing and spraying a plurality ofinteracting materials comprising:

A. a discharge manifold block having a front face surface,

B. an air passageway in the manifold block discharging through the frontface surface of the block,

C. a plurality of material passageways extending parallel with said airpassageway in the block discharging through the front surface of theblock,

said air passageway and each of said material passageways individuallydischarging through said front face surface of said block at spacedpositions from each other,

E. a disposable nozzle having a mounting shank forming a mixing chamberwith the front face surface of the block when demountably secured overthe front face of the block,

F. a plurality of material supply reservoirs,

G. an individual pump connected to each supply reservoir and eachdischarging into one of the material passageways,

H. an air pressure supply connected into the air passageway,

and

I. a common manual control device for simultaneously regulating the flowfrom the pumps to the material passageways and mixing chamber.

1. A spray gun for initially mixing and spraying a plurality ofinteracting materials comprising: A. a discharge manifold block having afront face surface, B. an air passageway in the manifold blockdischarging through the front face surface of the block, C. a pluralityof material passageways extending parallel with said air passageway inthe block discharging through the front surface of the block, D. saidair passageway and each of said material passageways individuallydischarging through said front face surface of said block at spacedpositions from each other, E. a disposable nozzle having a mountingshank forming a mixing chamber with the front face surface of the blockwhen demountably secured over the front face of the block, F. aplurality of material supply reservoirs, G. an individual pump connectedto each supply reservoir and each discharging into one of the materialpassageways, H. an air pressure supply connected into the airpassageway, and I. a common manual control device for simultaneouslyregulating the flow from the pumps to the material passageways andmixing chamber.